.banner{
    width: 512px;
    height: 908px;
    position: relative;
    margin: 100px auto;
    border: 1px solid red;
}
.banner .wrap{
    width: 100%;
}
.banner .wrap .item{
    width: 100%;
}
.item img{
    width: 512px;
    height: 908px;
    vertical-align: top;
    position: absolute;
}
.item h1{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    font-size: 20px;
    font-weight: normal;
    color: black;
    font-family: sans-serif;
}
.div1{
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    width: 41px;
    height: 69px;
    font-size: 30px;
    line-height: 70px;
    text-align: center;
    color: aliceblue;
    background-color: grey;
}
.div2{
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    width: 41px;
    height: 69px;
    font-size: 30px;
    line-height: 70px;
    text-align: center;
    color: aliceblue;
    background-color: grey;
}
.pagenation{
    position:absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    bottom: 40px;
}
.pagenation>div{
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: white;
    margin-left: 10px;
    cursor: pointer;
}
.pagenation>div:last-child{
    margin-right: 0;
}
